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Oral presentation

Inverse analysis methods for characterization of hydrogeological heterogeneity

Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project; Rock mechanical investigations around the GL.-500m closure test drift

Kuwabara, Kazumichi; Ozaki, Yusuke; Matsui, Hiroya

no journal, , 

In the rock mechanical investigations at the Phase II, the research aims at "Characterization of geological environment in the Excavation Disturbed Zone (EDZ)" from the viewpoint of safety assessment. For the research, the specific information of the EDZ such as (1) size and structures, (2) petrophysical/geomechanical properties, and (3) stress state are required. The research also aims at "Characterization of geomechanical stability around tunnel" from the viewpoint of design and construction of underground facilities. For the research, the specific information such as (4) local stress regime, (5) spatial variability of petrophysical/geomechanical properties of rocks, and (6) distribution of discontinuities intersecting underground tunnels are required. The measurement system for rock mass behavior has been manufactured and set for groundwater recovery experiment in the Phase III. This report presents the results of following rock mechanical investigations conducted in FY 2014. In situ stress measurements using Compact Conical-ended Borehole Overcoring Technique were performed at the - 500m stage. Measurement system for rock massdisplacement using optical fiber was installed at the - 500m stage as part of the groundwater recovery experiment.

Oral presentation

Mizunami Underground Research Laboratory Project, Development of drift backfilling technique; Drift closure test by water filling

Iwatsuki, Teruki

no journal, , 

Current status on research and development of drift backfilling technology in Mizunami Underground Research Laboratory was summarized.

Oral presentation

Mizunami Underground Research Laboratory Project; Study on engineering technology

Matsui, Hiroya; Mikake, Shinichiro

no journal, , 

Outcome and knowledge obtained by the study on engineering technology of MIU project in fiscal 2014 year will be presented as the poster session to open a public.

Oral presentation

CHIME monazite dating using FE-EPMA

Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro; Sueoka, Shigeru; Niwa, Masakazu

no journal, , 

The CHIME (Chemical Th-U-total Pb isochron method) dating has been performed on JEOL JXA-8530F FE-EPMA introduced in Tono Geoscience Center of Japan Atomic Energy Agency. Analysis of Pb on conventional spectrometers have disadvantage in count rate. JXA-8530F equipped with three R=100 provides significant shortening in analyzing time. Spectral interferences peculiar to R=100 mm spectrometers are found to be collected on the monazite analyses. The intrinsic responses of the R=100 mm counting systems with a PET crystal and a sealed Xe detector for PbM$$beta$$ are around ten times higher than that of the JCXA-733 counting systems. The measurement time required for a spot is ca. 35 minutes. The advanced procedure carried out 425$$pm$$25 Ma for monazite from Cooma granite in southeastern Australia, which had dated by SHRIMP as 432.8$$pm$$3.5 Ma. The CHIME monazite age of the Kojaku granite in southwestern Japan is 68$$pm$$5 Ma that accords well with the LA-ICP-MS U-Pb zircon ages of 68.5$$pm$$0.7 Ma.

Oral presentation

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Development of gas-strip techniques of dissolved inorganic carbon for dating groundwater

Kato, Toshihiro; Iwatsuki, Teruki; Munemoto, Takashi; Kubota, Mitsuru; Hayashida, Kazuki; Nakata, Kotaro*; Hasegawa, Takuma*

no journal, , 

no abstracts in English

Oral presentation

Joint research between KGE and JAEA; Feasibility study for the geological survey in deep underground using cosmic ray muons

Sasao, Eiji; Yamada, Nobuto*; Suzuki, Keiichi*; Kuboshima, Koji*

no journal, , 

We performed investigation of fault with thick and clay-altered damaged zone in granitic rock used by cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of investigated site consists of sedimentary sequence and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A fault with thick and clay-altered damaged zone is vertically distributed in granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm$$^{3}$$, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm$$^{3}$$, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm$$^{3}$$. This result indicates that cosmic ray muons have good potential to detect geological structure.

Oral presentation

Distribution of rare earth elements between deep groundwater and fracture-filling calcite at the Mizunami Underground Research Laboratory

Munemoto, Takashi; Iwatsuki, Teruki; Kato, Toshihiro; Kubota, Mitsuru; Hayashida, Kazuki

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project; Hydrogeological study during the operation phase; Understanding of hydrogeological study on groundwater recovery experiment in tunnel

Beppu, Shinji; Onoe, Hironori; Kohashi, Akio; Ueno, Tetsuro; Takayasu, Kentaro; Takeuchi, Ryuji; Ishibashi, Masayuki; Sawada, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Oral presentation

CRIEPI-JAEA collaborative study; Study on hydrogeological and mass transport property of rock mass in and around the Mizunami Underground Research Laboratory

Tanaka, Yasuharu*; Nohara, Shintaro*; Hasegawa, Takuma*; Yata, Kotaro*; Hama, Katsuhiro; Iwasaki, Riyo

no journal, , 

no abstracts in English

Oral presentation

Mizunami Underground Research Laboratory Project, Development of modeling methodology for the mass transport in the geological environment; Evaluation of mass transport phenomena in the Toki Granite

Hama, Katsuhiro

no journal, , 

The development of modeling methodology for the mass transport in the geological environment is one of the important issues in the Mizunami Underground Research Laboratory Project. The main goal of this issue is to develop methodology for the characterization of mass transport property in the fractured crystalline rock. To achieve this goal, the study concerning mass transport phenomena in the Toki Granite should be carried out. The current status of this study has been presented.

Oral presentation

RWMC-JAEA Joint Research; Research for geological environmental monitoring by wireless underground communication technologies

Takeuchi, Ryuji; Iwatsuki, Teruki; Takayasu, Kentaro; Kawakubo, Masahiro*; Kobayashi, Masato*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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